Generator brush



Oct. 13,1925.

J. H. HUNT GENERATOR BRUSH Filed Oct. 1923 W l 3 1 if 2W2 5 H g .LLZZ27E5'5E5 Patented Oct. 13, 1925.

UNITED STATES ifs-57,202

PATENT OFFICE.

JOHN H. HUNT, OF DAYTON, OHIO, ASSIGNOR TO GENERAL MOTORS RESEARCH COR-PORATIO'N, OF DAYTON, OHIO, A CORPORATION OF DELAWARE.

GENERATOR BRUSH.

I Application filed October 8, 1923. Serial No. 666,261.

To all whom it may concern:

Be it known that I, JOHN H. HUNT, cit-izen of the United States ofAmerica, residin at Dayton, county of Montgomery, and tate of Ohio, haveinvented certain new and useful Improvements in Generator Brushes, ofwhich the following is a full, clear, and exact description.

This invention relates to improvements in brushes for electricalmachines.

It is among the objects of the present invention to form a compositionbrush having integral therewith a bracket adapted to be attached to anelectric machine in any suitable manner.

Another object of the present invention is a brush of which the eaterportion may be utilized without en angering the commutator by engagementwith the bracket portion of the brush.

Further objects and advantages of the present invention will be apparentfrom the following description, reference being had to the accompanyingdrawing wherein a preferred form of the invention is clearly shown.

In the drawings:

Fig. 1 is a side view of the brush.

Fig. 2 is a front elevation of the brush.

Fig. 3 is a detail view of the bracket portion of the brush.

Fig. 4 is a sectional view of 'a modified form of brush construction.

Fig. 5 is a front view of this same modified form a portion being shownin section.

Referring to the drawings, the numeral 20 designates the L-section,metal bracket including legs or sides 21 and 22, arranged atright-angles to each other. In the side 21 there are provided two holes23 fo receiving screws or studs for securing the bracket to any suitablebrush 'arm. On the side 22 of the bracket there are provided angulartongues which, as is shown on the drawing, are punched out cf the side22 itself and bent at right angles thereto. .These tongues 24 may alsobe secured to the side 22 in any suitable manner and not formed integraltherewith as shown on the drawing. 25. designates the brush body made upof any suitable conducting material. As shown in the Figs. 1 and 2, thebrush engages with one surface of the side 22 of the bracket 20 and hasthe tongues 24 projecting into the body thereof.

In making this brush the bracket 20 may be inserted in any suitable dieand the brush composition dumped into the die and compressed. The die isso shaped that when finished the four sides of the brush will align withthe four edges of the side 22 of the bracket. The tongues 24 beingimbedded in the brush material will tend to hold this portion securelyin position on the bracket.

Referrin to the modified form of construction s own in Fig. 4 and Fig.5, the bracket 20 has angularly arranged sides 21 and 22. Holes 23 areprovided in the side 21 for attaching the bracket to an electricmachine. The side 22 is provided with tapered holes 26, the smallerdiameter of the holes being on the outer surface of the side 22. Inmaking up this brush the bracket is inserted in a suitable die and thebrush composition dumped into the die and compressed. In thiscompressing operation part of the brush composition Wlll be squeezed upinto thetapered holes 26 and thus form interlocking means with the side22 of the bracket to hold the two parts securely together to form anintegral whole.

By the use of some compositions in constructing the brush itmight benecessary to heat treat the brush assembly after the brush material hasbeen pressed into shape and ositioned on the bracket.

W ile the form of embodiment of the invention as disclosed, constitutesa preferred form, it is to be understood that other forms might beadopted, all coming within the scope of the claims which follow.

What I claim is as follows:

1. The method of making a composition brush which comprises forming abracket having two sides angularly arranged; forming tongues projectingfrom one of the sides and a plurality of holes in the other side; andpressing a mass of conducting material onto the side of the bracketincluding the tongues whereby said mass will have the ing an integralwhole.

tongues embedded in its body portion form- 2. The method of making acomposition brush which comprises formir'r a bracket having two sidesarranged at right angles; forming tongues on one of the sides andangular] arranged therewith and a plurahty 0 holes in the other side;pressing a mass of conduct-in material onto the side of the bracketinclu in the tongues whereby said mass will have t e tongues embedded inits body portion; and heat treating the assembly.

3. The method of making a com sition brush which comprises forming aracket having two legs angularly arranged; pro- 10 viding one of thelegs with means for anchoring thereto a mass of molded brush material;and in securing b a molding operation a quantity of brine material tothe leg. having the anchoring means.

In testimony whereof I hereto aflix my signature.

JOHN H. HUNT.

